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Vectorial control of nonlinear emission via chiral butterfly nanoantennas: Generation of pure high order nonlinear vortex beams

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Original languageEnglish
Pages (from-to)2569-2582
Number of pages14
JournalOptics express
Volume25
Issue number3
Publication statusPublished - Feb 2017
Externally publishedYes

Abstract

We report on a chiral gap-nanostructure, which we term a "butterfly nanoantenna," that offers full vectorial control over nonlinear emission. The field enhancement in its gap occurs for only one circular polarization but for every incident linear polarization. As the polarization, phase and amplitude of the linear field in the gap are highly controlled, the linear field can drive nonlinear emitters within the gap, which behave as an idealized Huygens source. A general framework is thereby proposed wherein the butterfly nanoantennas can be arranged in a metasurface, and the nonlinear Huygens sources exploited to produce a highly structured far-field optical beam. Nonlinearity allows us to shape the light at shorter wavelengths, not accessible by linear plasmonics, and resulting in high purity beams. The chirality of the butterfly allows us to create orbital angular momentum states using a linearly polarized excitation. A third harmonic Laguerre-Gauss beam carrying an optical orbital angular momentum of 41 is demonstrated as an example, through large-scale simulations on a high-performance computing platform of the full plasmonic metasurface with an area large enough to contain up to 3600 nanoantennas.

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Vectorial control of nonlinear emission via chiral butterfly nanoantennas: Generation of pure high order nonlinear vortex beams. / Lesina Cala', Antonino; Berini, Pierre; Ramunno, Lora.
In: Optics express, Vol. 25, No. 3, 02.2017, p. 2569-2582.

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Download

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T1 - Vectorial control of nonlinear emission via chiral butterfly nanoantennas

T2 - Generation of pure high order nonlinear vortex beams

AU - Lesina Cala', Antonino

AU - Berini, Pierre

AU - Ramunno, Lora

PY - 2017/2

Y1 - 2017/2

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AB - We report on a chiral gap-nanostructure, which we term a "butterfly nanoantenna," that offers full vectorial control over nonlinear emission. The field enhancement in its gap occurs for only one circular polarization but for every incident linear polarization. As the polarization, phase and amplitude of the linear field in the gap are highly controlled, the linear field can drive nonlinear emitters within the gap, which behave as an idealized Huygens source. A general framework is thereby proposed wherein the butterfly nanoantennas can be arranged in a metasurface, and the nonlinear Huygens sources exploited to produce a highly structured far-field optical beam. Nonlinearity allows us to shape the light at shorter wavelengths, not accessible by linear plasmonics, and resulting in high purity beams. The chirality of the butterfly allows us to create orbital angular momentum states using a linearly polarized excitation. A third harmonic Laguerre-Gauss beam carrying an optical orbital angular momentum of 41 is demonstrated as an example, through large-scale simulations on a high-performance computing platform of the full plasmonic metasurface with an area large enough to contain up to 3600 nanoantennas.

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